Bug 935473 - Replace ViewGroup.MarginLayoutParams with MarginLayoutParams (r=sriram)
Bug 935473 - Avoid unnecessary animations in forward button (r=wesj)
Bug 935473 - Factor out method to animate forward button's visibility (r=wesj)
Bug 935473 - Update forward button visibility when exiting editing mode (r=wesj)
Bug 935473 - Change updateBackButton/updateForwardButton to take a Tab argument (r=wesj)
Bug 935473 - Add comment explaining animateForwardButton's behaviour (r=wesj)
Bug 935473 - Change animateForwardButton() to take an animation argument (r=wesj)